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EARNINGS PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Earnings Per Share Details
Net income (loss) available to common shareholders	$ 12,858us-gaap_NetIncomeLossAttributableToNoncontrollingInterest	$ (9,811)us-gaap_NetIncomeLossAttributableToNoncontrollingInterest
Effect of dilutive securities
Derivative liability - warrants	(1,444)BVX_DerivativeLiabilityWarrantsNumerator
Accretion on convertible preferred stock	222BVX_AccretionOnConvertiblePreferredStockNumerator
Numerator for diluted income (loss) per common share	11,636BVX_NumeratorForDilutedIncomeLossPerCommonShare	(9,811)BVX_NumeratorForDilutedIncomeLossPerCommonShare
Weighted average shares used to compute basic income (loss) per common share	18,615us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	17,684us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Effect of dilutive securities:
Derivative liability - warrants	326BVX_DerivativeLiabilityWarrantsDenominator
Convertible preferred stock	1,116BVX_ConvertiblePreferredStock
Stock options	413BVX_StockOptions
Denominator for diluted income (loss) per common share	$ 20,470BVX_DenominatorForDilutedIncomeLossPerCommonShare	$ 17,684BVX_DenominatorForDilutedIncomeLossPerCommonShare
Basic income (loss) per common share	$ 0.69us-gaap_EarningsPerShareBasic	$ (0.55)us-gaap_EarningsPerShareBasic
Diluted income (loss) per common share	$ 0.57us-gaap_EarningsPerShareDiluted	$ (0.55)us-gaap_EarningsPerShareDiluted

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